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CVE-2026-86818 fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization

🗓️ 15 Sep 2026 10:40:38Reported by openjsType 
cvelist
 cvelist
🔗 www.cve.org👁 5 Views

fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv, that added a mailto scheme parser in version 4.1.3. In versions 4.1.3 and 4.1.4, the mailto parser compares each query field name to the reserved names to, sub...

Related
Affected
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-86818
15 Sep 202610:44
circl
cve
CVE
CVE-2026-86818
15 Sep 202610:40
cve
euvd
EUVD
EUVD-2026-78403
15 Sep 202610:40
euvd
nvd
NVD
CVE-2026-86818
15 Sep 202611:17
nvd
ptsecurity
Positive Technologies
PT-2026-91923
15 Sep 202600:00
ptsecurity
redhatcve
RedhatCVE
CVE-2026-86818
15 Sep 202611:47
redhatcve
vulnrichment
Vulnrichment
CVE-2026-86818 fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization
15 Sep 202610:40
vulnrichment
[
  {
    "vendor": "fast-uri",
    "product": "fast-uri",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "versionType": "semver",
        "status": "affected",
        "version": "4.1.3",
        "lessThan": "4.1.5"
      },
      {
        "versionType": "semver",
        "status": "unaffected",
        "version": "4.1.5"
      }
    ],
    "packageURL": "pkg:npm/fast-uri"
  }
]

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15 Sep 2026 10:40Current
CVSS 3.14.8
5